Navigate between fragments using button in toolbar

Question

In my app, I want the process of creating a new record to be divided into several steps in which users are queried about different information. So I created an activity with NavHostFragment and want to use a navigation graph to switch between fragments using a next button in the toolbar of this activity.

Is it possible to configure the button to navigate between fragments based on a navigation graph? Is this a good approach? Should I rather use a new activity for each step? I am new to android development so I am not sure what is the best way to do this.

score 1 · Accepted Answer · edited Nov 10 '20 at 16:51

You can handle it with your navigation graph

Handle toolbar click events in your fragments:

https://stackoverflow.com/a/30077965/11982611

While handling each fragment's next button click event implement your navigation code
```
findNavController().navigate(Your action)
```

Handle all navigation process in your Activity's OnItemOpotionsSelected Listener

override fun onOptionsItemSelected(item: MenuItem): Boolean {

val navHostFragment = supportFragmentManager.primaryNavigationFragment
val fragment = navHostFragment?.childFragmentManager?.fragments?.get(0)

when(item.itemId)
{
    android.R.id.home->super.onBackPressed()
    R.id.next-> {
         if(fragment is Fragment1)
         {
            fragment.findNavController().navigate(Fragment1toFragmen2 action)}

         if(fragment is Fragment2)
         {
            fragment.findNavController().navigate(Fragment2toFragmen3 action)}
    }

    return true
}

Thank you, I tried to handle the navigation in my activity using the ```onOptionsItemSelected ``` method and it works exactly as I wanted. However, when I move from fragment2 back to fragment1 the back button in my action bar disappears and is no more visible only for fragment1. Do you have an idea why? I set it in my activity with ```setDisplayHomeAsUpEnabled(true)```. — Jan Koci, Nov 10 '20 at 14:35
It is because the navigation components backstack problem. You need to override onBackPressed method to achieve what you want. — Eren Tüfekçi, Nov 10 '20 at 14:45

Navigate between fragments using button in toolbar

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